William Forster may refer to:
- William Forster (English politician), MP for Berkshire in 1572–1576.
- William Forster (bishop) (died 1635), Church of England bishop of Sodor and Man.
- William Forster (philanthropist) (1784–1854), Quaker preacher and philanthropist.
- William Forster (British Army officer) (1798–1870) British Army Officer.
- William Forster (Australian politician) (1818–1882), Premier of New South Wales and poet.
- William Edward Forster (1818–1886), British statesman, Liberal MP, and Chief Secretary for Ireland.
- William Mark Forster (1846–1921), Australian philanthropist.
- Henry Forster, 1st Baron Forster of Lepe (1866–1936), also known as Henry William Forster, Governor-General of Australia.
- William Forster (judge) (1921–1997), first Chief Justice of the Northern Territory.
- See also
- William Forster Lloyd, British economist,